Brock, perhaps you can suggest that mum and dad go to Sydney for a 'weekend away' while you spend time at the airport? I'm sure they'll find plenty to do while you're spotting and having dinner on Saturday night
John, I must be way out of touch with the current schooling system, but I thought weekends meant that kids had the free time to go and do things.
It would give the interstaters time to fly in on Friday night or Saturday morning and fly home on Sunday evening and still be back to school on Monday morning.
But seriously, the proposed months I've suggested were to purposely avoid school holidays so that during that time the younger mob can go on family holidays or do family activities (which their parents may/will appreciate).